The Main Digestive Enzymes Enzyme Group Enzyme Substrate Product Carbohydrases Salivary amylase Maltase Carbohydrate eg starch maltose maltose glucose Proteases Pepsin needs HCl ID: 777773
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Slide1
Absorption Revision
Slide2Types of Food
Slide3The Main Digestive Enzymes
Enzyme Group
Enzyme
Substrate
Product
Carbohydrases
Salivary amylase
Maltase
Carbohydrate
e.g. starch
maltose
maltose,
glucose
Proteases
Pepsin
(needs HCl) )
Protein
Peptides,
amino acids
Lipases
Lipase
Fats
Fatty acids
+ glycerol
Slide4Starch Digestion
Long starch molecule broken up by amylase maltose
Maltose broken down by maltase glucose
Slide5Protein Digestion
Protein chain of different amino acids
Broken down by proteases
Shorter chains (peptides) of amino acids
Broken down by peptidases
Individual amino acids (20 types approx.)
Slide6Fat Digestion
Large fat globule
Bile
Small fat globules
Fat molecule
(glycerol +3 fatty acids)
Lipase
1 glycerol
3 fatty acids
Slide7Slide8Absorption in the Small Intestine
Slide9Structure of a Villus
Slide10Slide11Lung Structure
Slide12Gas Exchange in the Alveoli
Alveoli
increase the surface area
for gas exchange
They have a
rich blood supply
They have
thin walls
(one cell thick) to allow easy diffusion
They have
moist surfaces
(allows easier diffusion of gases)Oxygen diffuses into the bloodCarbon dioxide diffuses out
Blood carries oxygen to the cells and brings carbon dioxide from the cells to the lungs
Slide13Slide14Gas Exchange